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Joined: Feb 2011
Posts: 3,136
ChatMaster - 3,000
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OP
ChatMaster - 3,000
Joined: Feb 2011
Posts: 3,136 |
My '47 Fleetmaster 216...Suddenly developed an intermittent "Knock"...seems to come from cyl.#5 or thereabouts...only at idle...and the sound is a loud hollow "CLOCK"...it is not consistent..once every 4 or 5 seconds..sometimes not...raise rpm and its gone! Motor oil is clean
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Possible sticking valve. You can pour some Marvel Mystery oil down through the throat of the carburetor with the engine running or remove the valve cover and squirt some (thru the valve spring) on the valve stems/guides of that cylinder.
At that time tou could also observe the push rod.rocker arm movement witht the engine running.
Gene Schneider
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Joined: Feb 2011
Posts: 3,136
ChatMaster - 3,000
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OP
ChatMaster - 3,000
Joined: Feb 2011
Posts: 3,136 |
I guess I'm lucky enough not to know what the sound of a "rod knock" is...rocker arm cover is off at this moment...its been rebuilt recently..really clean! Machining two new Washer/Bushing deals for the cover (out of Delrin) old ones just fell apart.
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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Joined: Oct 2006
Posts: 147
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Oct 2006
Posts: 147 |
Just at thought, with the valve cover off and engine running, carefully grab esch push rod with two fingers and keep it from turning. see if that stops your knock. you may have a bent push rod and every time it goes around its hitting the engine side pan. this happened to me after the valves were adjusted and one was alittle too tight and bent the push rod just enough to hit part of the engine side pan. That caused my knock to come and go.
Ken Ippolito
1936 Master Deluxe Town Sedan ,1938 Master Town Sedan, 1950 Styleline Deluxe
CHEVROLET, The only complete low-priced car
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